added: some methods for parsing from a string

git-svn-id: svn://ttmath.org/publicrep/pikotools/trunk@412 e52654a7-88a9-db11-a3e9-0013d4bc506e
master
Tomasz Sowa 11 years ago
parent e25bc826e7
commit 0ffb2b155f

@ -255,6 +255,35 @@ void Date::AssertCorrectDate()
}
bool Date::IsCorrectDate()
{
// 10000 is only a 'cosmetic' limit
// we can make calculations with greater values
if( year < 1970 || year > 10000 )
return false;
if( month < 1 || month > 12 )
return false;
if( day < 1 || day > MonthLen(year, month) )
return false;
if( hour < 0 || hour > 23 )
return false;
if( min < 0 || min > 59 )
return false;
if( sec < 0 || sec > 59 )
return false;
return true;
}
int Date::MonthLen(int y, int m)
{
@ -381,5 +410,7 @@ return (int)((d+3) % 7);
} // namespace

@ -48,11 +48,14 @@ namespace PT
/*
this class represents a Date (year, month, day, hour, min, sec)
it has O(1) algorithm when converting from/to time_t (seconds from unix epoch)
it has O(1) algorithm when converting from/to time_t (seconds from the Unix Epoch)
algorithm description:
http://alcor.concordia.ca/~gpkatch/gdate-algorithm.html
http://alcor.concordia.ca/~gpkatch/gdate-method.html
current limitation:
we do not support leap seconds
*/
class Date
{
@ -60,24 +63,41 @@ public:
/*
default c-ctor sets the unix epoch (Clear method): 1970.01.01 00:00:00
the date
*/
int year; // 1970 - ...
int month; // 1 - 12
int day; // 1 - 31
int hour; // 0 - 23
int min; // 0 - 59
int sec; // 0 - 59
/*
default c-ctor sets the Unix Epoch (Clear method): 1970.01.01 00:00:00
*/
Date();
/*
converting from Date, time_t (seconds from unix epoch), tm structure
converting from Date, time_t (seconds from the Unix Epoch), tm structure, and strings
*/
Date(const Date & d);
Date(time_t t);
Date(const tm & t);
template<class CStringType> Date(const CStringType * str);
template<class StringType> Date(const StringType & str);
Date & operator=(const Date & d);
Date & operator=(time_t t);
Date & operator=(const tm & t);
template<class CStringType> Date & operator=(const CStringType * str);
template<class StringType> Date & operator=(const StringType & str);
/*
adding/subtracting time_t (seconds from unix epoch)
adding/subtracting time_t (seconds from the Unix Epoch)
*/
Date operator+(time_t t) const;
Date operator-(time_t t) const;
@ -86,7 +106,7 @@ public:
/*
converts time_t in seconds (from unix epoch) to this object
converts time_t in seconds (from the Unix Epoch) to this object
*/
void FromTime(time_t t);
@ -98,7 +118,7 @@ public:
/*
returns time_t (in seconds from unix epoch)
returns time_t (in seconds from the Unix Epoch)
*/
time_t ToTime() const;
@ -158,7 +178,7 @@ public:
/*
set unix epoch: 1970.01.01 00:00:00
set the Unix Epoch: 1970.01.01 00:00:00
*/
void Clear();
@ -175,12 +195,24 @@ public:
void AssertCorrectDate();
/*
return true if values are from the correct range
year: 1970 - 10000
month: 1 - 12
day: 1 - MonthLen
hour: 0 - 23
min: 0 - 59
sec: 0 - 59
*/
bool IsCorrectDate();
/*
returns how many days there is in a month
y - year 1970 - ...
m - month 1-12
*/
static int MonthLen(int y, int m);
static int MonthLen(int y, int m);
/*
@ -207,11 +239,11 @@ public:
/*
this method outputs to the given stream: YYYY-MM-DD, eg. 1990.02.12
this method outputs to the given stream: YYYY-MM-DD, eg. 1990-02-12
ISO 8601 format
*/
template<class Stream>
void SerializeDay(Stream & out) const;
void SerializeYearMonthDay(Stream & out) const;
/*
@ -219,7 +251,7 @@ public:
ISO 8601 format
*/
template<class Stream>
void SerializeHour(Stream & out) const;
void SerializeHourMinSec(Stream & out) const;
/*
@ -231,14 +263,174 @@ public:
/*
the date
parsing day month and year
the input string can be as follows:
"12-10-2008"
white characters are ommited and the method stops after reading the year
so the input string can be:
" 12 - 10 - 2008some text "
a white character means a space or a tab
as a separator can be '-' '/' or '.'
so below strings have the same meaning:
" 12.10.2008 "
" 12/10 / 2008 "
this method doesn't test if the values are correct
use IsCorrectDate() to check
*/
int year; // 1970 - ...
int month; // 1 - 12
int day; // 1 - 31
int hour; // 0 - 23
int min; // 0 - 59
int sec; // 0 - 59
template<class CStringType>
bool ParseDayMonthYear(const CStringType * str, const CStringType ** str_after = 0);
template<class StringType>
bool ParseDayMonthYear(const StringType & str);
/*
parsing year month and day
the input string can be as follows:
"2008-10-12"
white characters are ommited and the method stops after reading the day
so the input string can be:
" 2008 - 10 - 12some text "
a white character means a space or a tab
as a separator can be '-' '/' or '.'
so below strings have the same meaning:
" 2008.10.12 "
" 2008/10 / 12 "
this method doesn't test if the values are correct
use IsCorrectDate() to check
*/
template<class CStringType>
bool ParseYearMonthDay(const CStringType * str, const CStringType ** str_after = 0);
template<class StringType>
bool ParseYearMonthDay(const StringType & str);
/*
parsing month and day
the input string can be as follows:
"10-12" (month: 10, day: 12)
white characters are ommited and the method stops after reading the day
so the input string can be:
" 10 - 12some text "
a white character means a space or a tab
as a separator can be '-' '/' or '.'
so below strings have the same meaning:
" 10.12 "
" 10 / 12 "
this method doesn't test if the values are correct
use IsCorrectDate() to check
*/
template<class CStringType>
bool ParseMonthDay(const CStringType * str, const CStringType ** str_after = 0);
template<class StringType>
bool ParseMonthDay(const StringType & str);
/*
parsing hour minutes and seconds
the input string can be as follows:
"14:10:35"
white characters are ommited and the method stops after reading seconds
so the input string can be:
" 14 : 10 : 35some text "
a white character means a space or a tab
a separator is only the ':' character
this method doesn't test if the values are correct
use IsCorrectDate() to check
*/
template<class CStringType>
bool ParseHourMinSec(const CStringType * str, const CStringType ** str_after = 0);
template<class StringType>
bool ParseHourMinSec(const StringType & str);
/*
parsing hour and minutes
the input string can be as follows:
"14:10"
white characters are ommited and the method stops after reading minutes
so the input string can be:
" 14 : 10some text "
a white character means a space or a tab
a separator is only the ':' character
this method doesn't test if the values are correct
use IsCorrectDate() to check
*/
template<class CStringType>
bool ParseHourMin(const CStringType * str, const CStringType ** str_after = 0);
template<class StringType>
bool ParseHourMin(const StringType & str);
/*
parsing hour and minutes (if exists) and seconds (if exists)
the input string can be as follows:
"14" -- only an hour given (min and sec will be zero)
"14:10" -- hour with minutes (sec will be zero)
"14:10:35" -- hour, minutes and seconds
white characters are ommited so these are valid strings too:
" 14 : 10 : 35 "
" 14 : 10 : 35some text "
a white character means a space or a tab
this method doesn't test if the values are correct
use IsCorrectDate() to check
*/
template<class CStringType>
bool ParseTime(const CStringType * str, const CStringType ** str_after = 0);
template<class StringType>
bool ParseTime(const StringType & str);
/*
parsing year/month/day hour:min:sec
the input strings can be as follows:
"2008-10-12 14:10:35"
"2008/10/12 14:10:35"
"2008.10.12 14:10:35"
"2008-10/12 14:10:35"
white characters are ommited
so the input string can be:
" 2008 - 10 / 12 14 : 10 : 35 "
a white character means a space or a tab
as a separator for year/month/day can be '-' '/' or '.'
see ParseYearMonthDay() for details
as a separator for hour:min:sec is the ':' character
see ParseHourMinSec() for details
at the end the method checks if the values are correct
(by using IsCorrectDate())
*/
template<class CStringType>
bool Parse(const CStringType * str, const CStringType ** str_after = 0);
template<class StringType>
bool Parse(const StringType & str);
private:
@ -248,14 +440,60 @@ private:
template<class Stream>
void SerializeInt(Stream & out, int val) const;
template<class CStringType>
void SetAfter(const CStringType * str, const CStringType ** str_after);
template<class CStringType>
void SkipWhite(const CStringType * & str);
template<class CStringType>
bool ReadInt(const CStringType * & str, int & result);
template<class CStringType>
bool SkipSeparator(const CStringType * & str, int separator, int separator2 = -1, int separator3 = -1);
};
template<class CStringType>
Date::Date(const CStringType * str)
{
// parsing can be break in the middle of the string (if errors)
// and some values would not be initialized
Clear();
Parse(str);
}
template<class StringType>
Date::Date(const StringType & str)
{
Clear();
Parse(str);
}
template<class CStringType>
Date & Date::operator=(const CStringType * str)
{
Parse(str);
}
template<class StringType>
Date & Date::operator=(const StringType & str)
{
Parse(str);
}
template<class Stream>
void Date::SerializeInt(Stream & out, int val) const
{
if( val < 10 )
if( val >= 0 && val < 10 )
out << '0';
out << val;
@ -264,7 +502,7 @@ void Date::SerializeInt(Stream & out, int val) const
template<class Stream>
void Date::SerializeDay(Stream & out) const
void Date::SerializeYearMonthDay(Stream & out) const
{
// !! IMPROVE ME the year should be printed with 4 digits, e.g. 0001 when the year is equal to one
out << year << '-';
@ -275,7 +513,7 @@ void Date::SerializeDay(Stream & out) const
template<class Stream>
void Date::SerializeHour(Stream & out) const
void Date::SerializeHourMinSec(Stream & out) const
{
SerializeInt(out, hour);
out << ':';
@ -284,12 +522,283 @@ void Date::SerializeHour(Stream & out) const
SerializeInt(out, sec);
}
template<class Stream>
void Date::Serialize(Stream & out) const
{
SerializeDay(out);
SerializeYearMonthDay(out);
out << ' ';
SerializeHour(out);
SerializeHourMinSec(out);
}
template<class CStringType>
bool Date::ParseDayMonthYear(const CStringType * str, const CStringType ** str_after)
{
bool result = false;
if( ReadInt(str, day) && SkipSeparator(str, '.', '-', '/') )
if( ReadInt(str, month) && SkipSeparator(str, '.', '-', '/') )
if( ReadInt(str, year) )
result = true;
SetAfter(str, str_after);
return result;
}
template<class StringType>
bool Date::ParseDayMonthYear(const StringType & str)
{
return ParseDayMonthYear(str.c_str());
}
template<class CStringType>
bool Date::ParseYearMonthDay(const CStringType * str, const CStringType ** str_after)
{
bool result = false;
if( ReadInt(str, year) && SkipSeparator(str, '.', '-', '/') )
if( ReadInt(str, month) && SkipSeparator(str, '.', '-', '/') )
if( ReadInt(str, day) )
result = true;
SetAfter(str, str_after);
return result;
}
template<class StringType>
bool Date::ParseYearMonthDay(const StringType & str)
{
return ParseYearMonthDay(str.c_str());
}
template<class CStringType>
bool Date::ParseMonthDay(const CStringType * str, const CStringType ** str_after)
{
bool result = false;
if( ReadInt(str, month) && SkipSeparator(str, '.', '-', '/') )
if( ReadInt(str, day) )
result = true;
SetAfter(str, str_after);
return result;
}
template<class StringType>
bool Date::ParseMonthDay(const StringType & str)
{
return ParseMonthDay(str.c_str());
}
template<class CStringType>
bool Date::ParseHourMinSec(const CStringType * str, const CStringType ** str_after)
{
bool result = false;
if( ReadInt(str, hour) && SkipSeparator(str, ':') )
if( ReadInt(str, min) && SkipSeparator(str, ':') )
if( ReadInt(str, sec) )
result = true;
SetAfter(str, str_after);
return result;
}
template<class StringType>
bool Date::ParseHourMinSec(const StringType & str)
{
return ParseHourMinSec(str.c_str());
}
template<class CStringType>
bool Date::ParseHourMin(const CStringType * str, const CStringType ** str_after)
{
bool result = false;
if( ReadInt(str, hour) && SkipSeparator(str, ':') )
if( ReadInt(str, min) )
result = true;
SetAfter(str, str_after);
return result;
}
template<class StringType>
bool Date::ParseHourMin(const StringType & str)
{
return ParseHourMin(str.c_str());
}
template<class CStringType>
bool Date::ParseTime(const CStringType * str, const CStringType ** str_after)
{
if( !ReadInt(str, hour) )
{
SetAfter(str, str_after);
return false;
}
min = 0;
sec = 0;
if( !SkipSeparator(str, ':') )
{
SetAfter(str, str_after);
return true; // only an hour given
}
if( !ReadInt(str, min) )
{
SetAfter(str, str_after);
return false;
}
if( !SkipSeparator(str, ':') )
{
SetAfter(str, str_after);
return true; // only an hour and minutes given
}
if( !ReadInt(str, sec) )
{
SetAfter(str, str_after);
return false;
}
SetAfter(str, str_after);
return true;
}
template<class StringType>
bool Date::ParseTime(const StringType & str)
{
return ParseTime(str.c_str());
}
template<class CStringType>
bool Date::Parse(const CStringType * str, const CStringType ** str_after)
{
const CStringType * after;
bool result = false;
if( ParseYearMonthDay(str, &after) )
if( ParseHourMinSec(after, &after) )
result = true;
SetAfter(after, str_after);
if( result )
result = IsCorrectDate();
return result;
}
template<class StringType>
bool Date::Parse(const StringType & str)
{
return Parse(str.c_str());
}
template<class CStringType>
void Date::SetAfter(const CStringType * str, const CStringType ** str_after)
{
if( str_after )
*str_after = str;
}
template<class CStringType>
void Date::SkipWhite(const CStringType * & str)
{
while( *str==' ' || *str=='\t' )
str += 1;
}
template<class CStringType>
bool Date::ReadInt(const CStringType * & str, int & result)
{
bool something_read = false;
SkipWhite(str);
result = 0;
while( *str >= '0' && *str <= '9' )
{
result = result * 10 + (*str - '0');
str += 1;
something_read = true;
if( result > 10000 )
{
// we assumed the max year to be 10000
return false;
}
}
return something_read;
}
template<class CStringType>
bool Date::SkipSeparator(const CStringType * & str, int separator, int separator2, int separator3)
{
SkipWhite(str);
if( *str == separator )
{
str += 1;
return true;
}
if( separator2 != -1 && *str == separator2 )
{
str += 1;
return true;
}
if( separator3 != -1 && *str == separator3 )
{
str += 1;
return true;
}
return false;
}

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